(function (name, definition) {
  if (typeof define === "function" && define.amd) {
    // RequireJS / AMD
    define(definition);
  } else if (typeof module !== "undefined" && module.exports) {
    // CommonJS / Node.js
    module.exports = definition();
  } else {
    // Direct include
    window.ysFixWebmDuration = definition();
  }
})("fix-webm-duration", function () {
  /*
   * This is the list of possible WEBM file sections by their IDs.
   * Possible types: Container, Binary, Uint, Int, String, Float, Date
   */
  var sections = {
    0xa45dfa3: { name: "EBML", type: "Container" },
    0x286: { name: "EBMLVersion", type: "Uint" },
    0x2f7: { name: "EBMLReadVersion", type: "Uint" },
    0x2f2: { name: "EBMLMaxIDLength", type: "Uint" },
    0x2f3: { name: "EBMLMaxSizeLength", type: "Uint" },
    0x282: { name: "DocType", type: "String" },
    0x287: { name: "DocTypeVersion", type: "Uint" },
    0x285: { name: "DocTypeReadVersion", type: "Uint" },
    0x6c: { name: "Void", type: "Binary" },
    0x3f: { name: "CRC-32", type: "Binary" },
    0xb538667: { name: "SignatureSlot", type: "Container" },
    0x3e8a: { name: "SignatureAlgo", type: "Uint" },
    0x3e9a: { name: "SignatureHash", type: "Uint" },
    0x3ea5: { name: "SignaturePublicKey", type: "Binary" },
    0x3eb5: { name: "Signature", type: "Binary" },
    0x3e5b: { name: "SignatureElements", type: "Container" },
    0x3e7b: { name: "SignatureElementList", type: "Container" },
    0x2532: { name: "SignedElement", type: "Binary" },
    0x8538067: { name: "Segment", type: "Container" },
    0x14d9b74: { name: "SeekHead", type: "Container" },
    0xdbb: { name: "Seek", type: "Container" },
    0x13ab: { name: "SeekID", type: "Binary" },
    0x13ac: { name: "SeekPosition", type: "Uint" },
    0x549a966: { name: "Info", type: "Container" },
    0x33a4: { name: "SegmentUID", type: "Binary" },
    0x3384: { name: "SegmentFilename", type: "String" },
    0x1cb923: { name: "PrevUID", type: "Binary" },
    0x1c83ab: { name: "PrevFilename", type: "String" },
    0x1eb923: { name: "NextUID", type: "Binary" },
    0x1e83bb: { name: "NextFilename", type: "String" },
    0x444: { name: "SegmentFamily", type: "Binary" },
    0x2924: { name: "ChapterTranslate", type: "Container" },
    0x29fc: { name: "ChapterTranslateEditionUID", type: "Uint" },
    0x29bf: { name: "ChapterTranslateCodec", type: "Uint" },
    0x29a5: { name: "ChapterTranslateID", type: "Binary" },
    0xad7b1: { name: "TimecodeScale", type: "Uint" },
    0x489: { name: "Duration", type: "Float" },
    0x461: { name: "DateUTC", type: "Date" },
    0x3ba9: { name: "Title", type: "String" },
    0xd80: { name: "MuxingApp", type: "String" },
    0x1741: { name: "WritingApp", type: "String" },
    // 0xf43b675: { name: 'Cluster', type: 'Container' },
    0x67: { name: "Timecode", type: "Uint" },
    0x1854: { name: "SilentTracks", type: "Container" },
    0x18d7: { name: "SilentTrackNumber", type: "Uint" },
    0x27: { name: "Position", type: "Uint" },
    0x2b: { name: "PrevSize", type: "Uint" },
    0x23: { name: "SimpleBlock", type: "Binary" },
    0x20: { name: "BlockGroup", type: "Container" },
    0x21: { name: "Block", type: "Binary" },
    0x22: { name: "BlockVirtual", type: "Binary" },
    0x35a1: { name: "BlockAdditions", type: "Container" },
    0x26: { name: "BlockMore", type: "Container" },
    0x6e: { name: "BlockAddID", type: "Uint" },
    0x25: { name: "BlockAdditional", type: "Binary" },
    0x1b: { name: "BlockDuration", type: "Uint" },
    0x7a: { name: "ReferencePriority", type: "Uint" },
    0x7b: { name: "ReferenceBlock", type: "Int" },
    0x7d: { name: "ReferenceVirtual", type: "Int" },
    0x24: { name: "CodecState", type: "Binary" },
    0x35a2: { name: "DiscardPadding", type: "Int" },
    0xe: { name: "Slices", type: "Container" },
    0x68: { name: "TimeSlice", type: "Container" },
    0x4c: { name: "LaceNumber", type: "Uint" },
    0x4d: { name: "FrameNumber", type: "Uint" },
    0x4b: { name: "BlockAdditionID", type: "Uint" },
    0x4e: { name: "Delay", type: "Uint" },
    0x4f: { name: "SliceDuration", type: "Uint" },
    0x48: { name: "ReferenceFrame", type: "Container" },
    0x49: { name: "ReferenceOffset", type: "Uint" },
    0x4a: { name: "ReferenceTimeCode", type: "Uint" },
    0x2f: { name: "EncryptedBlock", type: "Binary" },
    0x654ae6b: { name: "Tracks", type: "Container" },
    0x2e: { name: "TrackEntry", type: "Container" },
    0x57: { name: "TrackNumber", type: "Uint" },
    0x33c5: { name: "TrackUID", type: "Uint" },
    0x3: { name: "TrackType", type: "Uint" },
    0x39: { name: "FlagEnabled", type: "Uint" },
    0x8: { name: "FlagDefault", type: "Uint" },
    0x15aa: { name: "FlagForced", type: "Uint" },
    0x1c: { name: "FlagLacing", type: "Uint" },
    0x2de7: { name: "MinCache", type: "Uint" },
    0x2df8: { name: "MaxCache", type: "Uint" },
    0x3e383: { name: "DefaultDuration", type: "Uint" },
    0x34e7a: { name: "DefaultDecodedFieldDuration", type: "Uint" },
    0x3314f: { name: "TrackTimecodeScale", type: "Float" },
    0x137f: { name: "TrackOffset", type: "Int" },
    0x15ee: { name: "MaxBlockAdditionID", type: "Uint" },
    0x136e: { name: "Name", type: "String" },
    0x2b59c: { name: "Language", type: "String" },
    0x6: { name: "CodecID", type: "String" },
    0x23a2: { name: "CodecPrivate", type: "Binary" },
    0x58688: { name: "CodecName", type: "String" },
    0x3446: { name: "AttachmentLink", type: "Uint" },
    0x1a9697: { name: "CodecSettings", type: "String" },
    0x1b4040: { name: "CodecInfoURL", type: "String" },
    0x6b240: { name: "CodecDownloadURL", type: "String" },
    0x2a: { name: "CodecDecodeAll", type: "Uint" },
    0x2fab: { name: "TrackOverlay", type: "Uint" },
    0x16aa: { name: "CodecDelay", type: "Uint" },
    0x16bb: { name: "SeekPreRoll", type: "Uint" },
    0x2624: { name: "TrackTranslate", type: "Container" },
    0x26fc: { name: "TrackTranslateEditionUID", type: "Uint" },
    0x26bf: { name: "TrackTranslateCodec", type: "Uint" },
    0x26a5: { name: "TrackTranslateTrackID", type: "Binary" },
    0x60: { name: "Video", type: "Container" },
    0x1a: { name: "FlagInterlaced", type: "Uint" },
    0x13b8: { name: "StereoMode", type: "Uint" },
    0x13c0: { name: "AlphaMode", type: "Uint" },
    0x13b9: { name: "OldStereoMode", type: "Uint" },
    0x30: { name: "PixelWidth", type: "Uint" },
    0x3a: { name: "PixelHeight", type: "Uint" },
    0x14aa: { name: "PixelCropBottom", type: "Uint" },
    0x14bb: { name: "PixelCropTop", type: "Uint" },
    0x14cc: { name: "PixelCropLeft", type: "Uint" },
    0x14dd: { name: "PixelCropRight", type: "Uint" },
    0x14b0: { name: "DisplayWidth", type: "Uint" },
    0x14ba: { name: "DisplayHeight", type: "Uint" },
    0x14b2: { name: "DisplayUnit", type: "Uint" },
    0x14b3: { name: "AspectRatioType", type: "Uint" },
    0xeb524: { name: "ColourSpace", type: "Binary" },
    0xfb523: { name: "GammaValue", type: "Float" },
    0x383e3: { name: "FrameRate", type: "Float" },
    0x61: { name: "Audio", type: "Container" },
    0x35: { name: "SamplingFrequency", type: "Float" },
    0x38b5: { name: "OutputSamplingFrequency", type: "Float" },
    0x1f: { name: "Channels", type: "Uint" },
    0x3d7b: { name: "ChannelPositions", type: "Binary" },
    0x2264: { name: "BitDepth", type: "Uint" },
    0x62: { name: "TrackOperation", type: "Container" },
    0x63: { name: "TrackCombinePlanes", type: "Container" },
    0x64: { name: "TrackPlane", type: "Container" },
    0x65: { name: "TrackPlaneUID", type: "Uint" },
    0x66: { name: "TrackPlaneType", type: "Uint" },
    0x69: { name: "TrackJoinBlocks", type: "Container" },
    0x6d: { name: "TrackJoinUID", type: "Uint" },
    0x40: { name: "TrickTrackUID", type: "Uint" },
    0x41: { name: "TrickTrackSegmentUID", type: "Binary" },
    0x46: { name: "TrickTrackFlag", type: "Uint" },
    0x47: { name: "TrickMasterTrackUID", type: "Uint" },
    0x44: { name: "TrickMasterTrackSegmentUID", type: "Binary" },
    0x2d80: { name: "ContentEncodings", type: "Container" },
    0x2240: { name: "ContentEncoding", type: "Container" },
    0x1031: { name: "ContentEncodingOrder", type: "Uint" },
    0x1032: { name: "ContentEncodingScope", type: "Uint" },
    0x1033: { name: "ContentEncodingType", type: "Uint" },
    0x1034: { name: "ContentCompression", type: "Container" },
    0x254: { name: "ContentCompAlgo", type: "Uint" },
    0x255: { name: "ContentCompSettings", type: "Binary" },
    0x1035: { name: "ContentEncryption", type: "Container" },
    0x7e1: { name: "ContentEncAlgo", type: "Uint" },
    0x7e2: { name: "ContentEncKeyID", type: "Binary" },
    0x7e3: { name: "ContentSignature", type: "Binary" },
    0x7e4: { name: "ContentSigKeyID", type: "Binary" },
    0x7e5: { name: "ContentSigAlgo", type: "Uint" },
    0x7e6: { name: "ContentSigHashAlgo", type: "Uint" },
    0xc53bb6b: { name: "Cues", type: "Container" },
    0x3b: { name: "CuePoint", type: "Container" },
    0x33: { name: "CueTime", type: "Uint" },
    0x37: { name: "CueTrackPositions", type: "Container" },
    0x77: { name: "CueTrack", type: "Uint" },
    0x71: { name: "CueClusterPosition", type: "Uint" },
    0x70: { name: "CueRelativePosition", type: "Uint" },
    0x32: { name: "CueDuration", type: "Uint" },
    0x1378: { name: "CueBlockNumber", type: "Uint" },
    0x6a: { name: "CueCodecState", type: "Uint" },
    0x5b: { name: "CueReference", type: "Container" },
    0x16: { name: "CueRefTime", type: "Uint" },
    0x17: { name: "CueRefCluster", type: "Uint" },
    0x135f: { name: "CueRefNumber", type: "Uint" },
    0x6b: { name: "CueRefCodecState", type: "Uint" },
    0x941a469: { name: "Attachments", type: "Container" },
    0x21a7: { name: "AttachedFile", type: "Container" },
    0x67e: { name: "FileDescription", type: "String" },
    0x66e: { name: "FileName", type: "String" },
    0x660: { name: "FileMimeType", type: "String" },
    0x65c: { name: "FileData", type: "Binary" },
    0x6ae: { name: "FileUID", type: "Uint" },
    0x675: { name: "FileReferral", type: "Binary" },
    0x661: { name: "FileUsedStartTime", type: "Uint" },
    0x662: { name: "FileUsedEndTime", type: "Uint" },
    0x43a770: { name: "Chapters", type: "Container" },
    0x5b9: { name: "EditionEntry", type: "Container" },
    0x5bc: { name: "EditionUID", type: "Uint" },
    0x5bd: { name: "EditionFlagHidden", type: "Uint" },
    0x5db: { name: "EditionFlagDefault", type: "Uint" },
    0x5dd: { name: "EditionFlagOrdered", type: "Uint" },
    0x36: { name: "ChapterAtom", type: "Container" },
    0x33c4: { name: "ChapterUID", type: "Uint" },
    0x1654: { name: "ChapterStringUID", type: "String" },
    0x11: { name: "ChapterTimeStart", type: "Uint" },
    0x12: { name: "ChapterTimeEnd", type: "Uint" },
    0x18: { name: "ChapterFlagHidden", type: "Uint" },
    0x598: { name: "ChapterFlagEnabled", type: "Uint" },
    0x2e67: { name: "ChapterSegmentUID", type: "Binary" },
    0x2ebc: { name: "ChapterSegmentEditionUID", type: "Uint" },
    0x23c3: { name: "ChapterPhysicalEquiv", type: "Uint" },
    0xf: { name: "ChapterTrack", type: "Container" },
    0x9: { name: "ChapterTrackNumber", type: "Uint" },
    0x0: { name: "ChapterDisplay", type: "Container" },
    0x5: { name: "ChapString", type: "String" },
    0x37c: { name: "ChapLanguage", type: "String" },
    0x37e: { name: "ChapCountry", type: "String" },
    0x2944: { name: "ChapProcess", type: "Container" },
    0x2955: { name: "ChapProcessCodecID", type: "Uint" },
    0x50d: { name: "ChapProcessPrivate", type: "Binary" },
    0x2911: { name: "ChapProcessCommand", type: "Container" },
    0x2922: { name: "ChapProcessTime", type: "Uint" },
    0x2933: { name: "ChapProcessData", type: "Binary" },
    0x254c367: { name: "Tags", type: "Container" },
    0x3373: { name: "Tag", type: "Container" },
    0x23c0: { name: "Targets", type: "Container" },
    0x28ca: { name: "TargetTypeValue", type: "Uint" },
    0x23ca: { name: "TargetType", type: "String" },
    0x23c5: { name: "TagTrackUID", type: "Uint" },
    0x23c9: { name: "TagEditionUID", type: "Uint" },
    0x23c4: { name: "TagChapterUID", type: "Uint" },
    0x23c6: { name: "TagAttachmentUID", type: "Uint" },
    0x27c8: { name: "SimpleTag", type: "Container" },
    0x5a3: { name: "TagName", type: "String" },
    0x47a: { name: "TagLanguage", type: "String" },
    0x484: { name: "TagDefault", type: "Uint" },
    0x487: { name: "TagString", type: "String" },
    0x485: { name: "TagBinary", type: "Binary" },
  };

  function doInherit(newClass, baseClass) {
    newClass.prototype = Object.create(baseClass.prototype);
    newClass.prototype.constructor = newClass;
  }

  function WebmBase(name, type) {
    this.name = name || "Unknown";
    this.type = type || "Unknown";
  }
  WebmBase.prototype.updateBySource = function () {};
  WebmBase.prototype.setSource = function (source) {
    this.source = source;
    this.updateBySource();
  };
  WebmBase.prototype.updateByData = function () {};
  WebmBase.prototype.setData = function (data) {
    this.data = data;
    this.updateByData();
  };

  function WebmUint(name, type) {
    WebmBase.call(this, name, type || "Uint");
  }
  doInherit(WebmUint, WebmBase);
  function padHex(hex) {
    return hex.length % 2 === 1 ? "0" + hex : hex;
  }
  WebmUint.prototype.updateBySource = function () {
    // use hex representation of a number instead of number value
    this.data = "";
    for (var i = 0; i < this.source.length; i++) {
      var hex = this.source[i].toString(16);
      this.data += padHex(hex);
    }
  };
  WebmUint.prototype.updateByData = function () {
    var length = this.data.length / 2;
    this.source = new Uint8Array(length);
    for (var i = 0; i < length; i++) {
      var hex = this.data.substr(i * 2, 2);
      this.source[i] = parseInt(hex, 16);
    }
  };
  WebmUint.prototype.getValue = function () {
    return parseInt(this.data, 16);
  };
  WebmUint.prototype.setValue = function (value) {
    this.setData(padHex(value.toString(16)));
  };

  function WebmFloat(name, type) {
    WebmBase.call(this, name, type || "Float");
  }
  doInherit(WebmFloat, WebmBase);
  WebmFloat.prototype.getFloatArrayType = function () {
    return this.source && this.source.length === 4
      ? Float32Array
      : Float64Array;
  };
  WebmFloat.prototype.updateBySource = function () {
    var byteArray = this.source.reverse();
    var floatArrayType = this.getFloatArrayType();
    var floatArray = new floatArrayType(byteArray.buffer);
    this.data = floatArray[0];
  };
  WebmFloat.prototype.updateByData = function () {
    var floatArrayType = this.getFloatArrayType();
    var floatArray = new floatArrayType([this.data]);
    var byteArray = new Uint8Array(floatArray.buffer);
    this.source = byteArray.reverse();
  };
  WebmFloat.prototype.getValue = function () {
    return this.data;
  };
  WebmFloat.prototype.setValue = function (value) {
    this.setData(value);
  };

  function WebmContainer(name, type) {
    WebmBase.call(this, name, type || "Container");
  }
  doInherit(WebmContainer, WebmBase);
  WebmContainer.prototype.readByte = function () {
    return this.source[this.offset++];
  };
  WebmContainer.prototype.readUint = function () {
    var firstByte = this.readByte();
    var bytes = 8 - firstByte.toString(2).length;
    var value = firstByte - (1 << (7 - bytes));
    for (var i = 0; i < bytes; i++) {
      // don't use bit operators to support x86
      value *= 256;
      value += this.readByte();
    }
    return value;
  };
  WebmContainer.prototype.updateBySource = function () {
    this.data = [];
    for (this.offset = 0; this.offset < this.source.length; this.offset = end) {
      var id = this.readUint();
      var len = this.readUint();
      var end = Math.min(this.offset + len, this.source.length);
      var data = this.source.slice(this.offset, end);

      var info = sections[id] || { name: "Unknown", type: "Unknown" };
      var ctr = WebmBase;
      switch (info.type) {
        case "Container":
          ctr = WebmContainer;
          break;
        case "Uint":
          ctr = WebmUint;
          break;
        case "Float":
          ctr = WebmFloat;
          break;
      }
      var section = new ctr(info.name, info.type);
      section.setSource(data);
      this.data.push({
        id: id,
        idHex: id.toString(16),
        data: section,
      });
    }
  };
  WebmContainer.prototype.writeUint = function (x, draft) {
    for (
      var bytes = 1, flag = 0x80;
      x >= flag && bytes < 8;
      bytes++, flag *= 0x80
    ) {}

    if (!draft) {
      var value = flag + x;
      for (var i = bytes - 1; i >= 0; i--) {
        // don't use bit operators to support x86
        var c = value % 256;
        this.source[this.offset + i] = c;
        value = (value - c) / 256;
      }
    }

    this.offset += bytes;
  };
  WebmContainer.prototype.writeSections = function (draft) {
    this.offset = 0;
    for (var i = 0; i < this.data.length; i++) {
      var section = this.data[i],
        content = section.data.source,
        contentLength = content.length;
      this.writeUint(section.id, draft);
      this.writeUint(contentLength, draft);
      if (!draft) {
        this.source.set(content, this.offset);
      }
      this.offset += contentLength;
    }
    return this.offset;
  };
  WebmContainer.prototype.updateByData = function () {
    // run without accessing this.source to determine total length - need to know it to create Uint8Array
    var length = this.writeSections("draft");
    this.source = new Uint8Array(length);
    // now really write data
    this.writeSections();
  };
  WebmContainer.prototype.getSectionById = function (id) {
    for (var i = 0; i < this.data.length; i++) {
      var section = this.data[i];
      if (section.id === id) {
        return section.data;
      }
    }
    return null;
  };

  function WebmFile(source) {
    WebmContainer.call(this, "File", "File");
    this.setSource(source);
  }
  doInherit(WebmFile, WebmContainer);
  WebmFile.prototype.fixDuration = function (duration, options) {
    var logger = options && options.logger;
    if (logger === undefined) {
      logger = function (message) {
        console.log(message);
      };
    } else if (!logger) {
      logger = function () {};
    }

    var segmentSection = this.getSectionById(0x8538067);
    if (!segmentSection) {
      logger("[fix-webm-duration] Segment section is missing");
      return false;
    }

    var infoSection = segmentSection.getSectionById(0x549a966);
    if (!infoSection) {
      logger("[fix-webm-duration] Info section is missing");
      return false;
    }

    var timeScaleSection = infoSection.getSectionById(0xad7b1);
    if (!timeScaleSection) {
      logger("[fix-webm-duration] TimecodeScale section is missing");
      return false;
    }

    var durationSection = infoSection.getSectionById(0x489);
    if (durationSection) {
      if (durationSection.getValue() <= 0) {
        logger(
          "[fix-webm-duration] Duration section is present, but the value is empty"
        );
        durationSection.setValue(duration);
      } else {
        logger("[fix-webm-duration] Duration section is present");
        return false;
      }
    } else {
      logger("[fix-webm-duration] Duration section is missing");
      // append Duration section
      durationSection = new WebmFloat("Duration", "Float");
      durationSection.setValue(duration);
      infoSection.data.push({
        id: 0x489,
        data: durationSection,
      });
    }

    // set default time scale to 1 millisecond (1000000 nanoseconds)
    timeScaleSection.setValue(1000000);
    infoSection.updateByData();
    segmentSection.updateByData();
    this.updateByData();

    return true;
  };
  WebmFile.prototype.toBlob = function (mimeType) {
    return new Blob([this.source.buffer], { type: mimeType || "video/webm" });
  };

  function fixWebmDuration(blob, duration, callback, options) {
    // The callback may be omitted - then the third argument is options
    if (typeof callback === "object") {
      options = callback;
      callback = undefined;
    }

    if (!callback) {
      return new Promise(function (resolve) {
        fixWebmDuration(blob, duration, resolve, options);
      });
    }

    try {
      var reader = new FileReader();
      reader.onloadend = function () {
        try {
          var file = new WebmFile(new Uint8Array(reader.result));
          if (file.fixDuration(duration, options)) {
            blob = file.toBlob(blob.type);
          }
        } catch (ex) {
          // ignore
        }
        callback(blob);
      };
      reader.readAsArrayBuffer(blob);
    } catch (ex) {
      callback(blob);
    }
  }

  // Support AMD import default
  fixWebmDuration.default = fixWebmDuration;

  return fixWebmDuration;
});

